Lilliput: Build COH archives

This is a breakout and a prerequisite for JDK-8325104.

In order to run with +COH and CDS enabled, and to enable tests testing this combination, we need to build archives with +COH too.

This expands the number of archives built to four:

- classes.jsa, classes_nocoops.jsa
- classes_coh.jsa, classes_nocoops_coh.jsa

But note that the upcoming JEP "CDS Archived Object Streaming" (JDK-8326035) will do away with the +-Coops distinction and possibly (though that's harder) later the +-COH distinction, too.

But that JEP has to be shipped first, and at first it will exist alongside the older, current, implementation it aims to replace. Until then I propose to build +-COH archives in addition to +-Coops archives.